usr/src/lib/libc/sparc/sys/forkx.s

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*      Copyright (c) 1988 AT&T */
  23 /*        All Rights Reserved   */
  24
  25 /*
  26  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27  * Use is subject to license terms.
  28  */
  29
  30         .file   "forkx.s"
  31
  32 #include "SYS.h"
  33
  34 /*
  35  * pid = __forkx(flags);
  36  *
  37  * syscall trap: forksys(0, flags)
  38  *
  39  * From the syscall:
  40  * %o1 == 0 in parent process, %o1 == 1 in child process.
  41  * %o0 == pid of child in parent, %o0 == pid of parent in child.
  42  *
  43  * The child gets a zero return value.
  44  * The parent gets the pid of the child.
  45  */
  46
  47         ENTRY(__forkx)
  48         mov     %o0, %o1
  49         clr     %o0
  50         SYSTRAP_2RVALS(forksys)
  51         SYSCERROR
  52         movrnz  %o1, 0, %o0
  53         RET
  54         SET_SIZE(__forkx)